Hay, yang naniniging ng puson mo ay normal lang, lalo na sa 31 weeks! Yan yung Braxton Hicks contractions, parang practice ng uterus mo para sa actual labor, feeling mo lang biglang tumigas tapos babalik sa normal after a few seconds or minutes. A few of us moms experience it differently, iba-iba ang frequency and intensity, so kung worried ka talaga or kung masakit siya or may spotting, it's best to message your OB para peace of mind mo lang kasi sila talaga ang makakaalam ng history mo!